web/postkey/models.py: add "last_seen" field

web/postkey/models.py

@@ -7,6 +7,8 @@ class i2phost(models.Model):
 	b64hash = models.CharField("Base 64 hash", max_length=616)
 	description = models.TextField("Description", blank=True)
 	date_added = models.DateTimeField(auto_now_add=True)
+	# Last time this host was up
+	last_seen = models.DateTimeField()
 	# Not-activated hosts will not appear in exported hosts.txt
 	activated = models.BooleanField(default=False)
 	# Indicator for hosts added from external source